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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Cash Flows From Operating Activities    
Net loss $ (3,344) $ (4,028)
Adjustments to reconcile net loss to net cash used in operating activities:    
Gain on investment in equity securities 0 (12)
Accretion on investments (22) (60)
Depreciation and amortization 70 67
Stock-based compensation 156 475
Increase (decrease) in cash resulting from changes in:    
Accounts receivable (15) 3
Inventory (111) 0
Prepaid expenses and other assets 118 149
Accounts payable 492 157
Accrued expenses (323) (2,061)
Operating lease right-of-use assets and liabilities, net (4) (1)
Net cash used in operating activities (2,983) (5,311)
Cash Flows From Investing Activities    
Purchases of fixed assets 0 (15)
Purchases of investments (1,480) (4,939)
Maturities of investments 1,500 5,000
Liquidation of equity securities 0 718
Net cash provided by investing activities 20 764
Cash Flows From Financing Activities    
Proceeds from issuance of common stock, net 6,249 0
Net cash provided by financing activities 6,249 0
Net increase in cash, cash equivalents, and restricted cash 3,286 (4,547)
Cash, cash equivalents, and restricted cash at beginning of period 3,044 15,444
Cash, cash equivalents, and restricted cash at end of period 6,330 10,897
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets    
Cash and cash equivalents 6,187 10,754
Restricted cash 143 143
Cash, cash equivalents, and restricted cash at end of period 6,330 10,897
Supplemental Disclosure of Cash Flow Information:    
Income taxes paid $ 2 $ 2